Classifying rake



D. M. WRIGHT 2,280,209

CLASSIFYING RAKE Filed sept. 22, 1939 2 sheets-shee 1 INVENTOR 2 .W 1 .Iwan-I IA a mw SMS 4 gif lrlll .w

April 21, 1942. y

ATTORNEY `April 21, 1942. D. M. WRIGHT CLASSIFYING RAKE 1959 2 Sheets-Sheet 2 Filed sept. 22

INVENTOR BY vv ATTORN EY tTT 5T- @hay .9km .WM

. partition `at the upper Patented` pr. 2l, 1942 UNITED STAT Es PATENT OFFICE l CLAS SIFYING RAKE HDavid Wright, Agricola,

dustrial Patents Fla., assgnor to Ini Corporation, Chicago, Ill., a corporation of Delaware .l

Appiieation september 22, 1939, serial N. 296,155

This invention relates classifiers. i y

One of the objects of the invention is to provide a reciprocal rake classifier comprising a plurality of `sections of varying inclinations.

Another object of the invention is to provide improved drainage of classified material.

Another object `of thefinvention is to provide an improved` ,linkage arrangement for operating tol ore conveyors and a sectional classifying rake, the sections of which pieces 32 as by Figure 3V is a side view Vpartlyin section show- A ing the rake and linkage mechanism of the device shown in Figures 1 and 2; I

The device consists oa trough I `with sides 2 1 and 3, lower end 4 and a bottom which consists of two sections 5, which is comparatively long and flat, and 6 atthe upper end thereof which is comparatively short and has a much greater inclination thansection 5. In the preferredembodiment of this devicethe trough has no i end thereof, the sloping oor 6 merging into the discharge trough l. The trough may be supported -by any suitable means such as uprights 8, 9, Il), II, |2,`|3`, I4 and`|5 and cross braces I6, I1, I3, I9, 29 and 2i. Preferably the uprights would be braced above the `trough by pieces 22, 23,` 24 and 25. At the lower end 4 of trough I is a spillway 28 for the removal of water carrying the finer particles of the material to be classied. l

The material to be classified is fed into the device by any suitable means such as charging chute 21 which may be supported in any suitable Way not shown. V

The rake 28 comprises two sectionsv 29 and 3|). Section 29 is slightly shorter than section 5 of the bottom of trough v| and is adapted to operate along it. Section 381s of a length comparable to section 6 of bottom 4 of trough I and is adapted to operate along thatsection. Section 29 of rake 28 consists of cross pieces 3| which .may be madeofordinary angle iron or other and 36. Sections y32 and 33, respectively,

i comme. (01.209-462) t suitable material affixed to sidepieces 32 and 33. Similarly, section 38; consists of cross lpieces 34 aliixed by any suitable method to side pieces 35 29 and'38 are hinged together by hinges 31, oneend of which is affixed to side pieces 35 by any suitable means as by rivets 39.` A similar hinge between sections 33 and V36 is not shown in the drawings. i p

Plates 48 and 4| are aiiixed to side pieces 32 and 33, respectively, near the lower end thereof by any suitable means as VAby rivets 42. Plates 43 upper ends of side pieces and 44 are aixed to the by any suitable means such asV rivets 45. `Plates tothe upper ends of `side tion 38 by any suitable Plate 48 is attached to means of link 5|) and pins 5| and 52. -Plate 4I is linked to bell crank lever 53 by means of link 54 and pins `55 and 55. Bell cranks4i9'and 53 are affixed to shaft 51, supported by keepers 53 and 59 attached to uprights 9 and I Il. Similarly, plate 43 is linked to bell crank lever'illv by means of link 6| ,and pins 4t2 and s3 and plate 44 is pieces 35 and 36 of secmeans such as rivets 43.

t linked to bell crank `lever 64 by means of ,link

65 and pins 66 andIil. Bell crank levers Eiland B4 are affixed to shaft 68, which is held in keepers 69 and in, affixed to uprights l2 and la. Ben

i crank lever 49 is attached tobell crank lever `til by means of link 1| and pins12, and 13. Similarly,bell cranklever 53 is'linked'to bell crank lever 64: Iby means of link `|4"and pins 15 and l18. Plate 46 is linked to bell crank lever 11 by means of link 18 and pins 19 and Plate 41 is linked to bell crank lever 8|"by means of link 32 and pins 83 and 84. Bell crank levers 1l' and 8| are affixed to shaft 85 held in keepers 85 and il?,V affixed to uprights I4 and I5. Bell crank lever 11 is linked to bell crank lever 90 by means of link 83 and pins 89 and 98, and similarly, bell crank lever`8| is linked to bell crank lever 64 by means of link 9| and pins 92 and 93. Attached to plate 43 by means of pin 63 is lever `arm 93 pivoted on bar 94, which is movably affixed to side 2 of trough I bymeans of pin 95 and to lever arm 93 by means of pin 96. The free end of lever arm 93 is affixed to crank 91 by means of crank pin 98. Crank 91 is rigidly aflixed to rotatable shaft 99 by any suitable means. The entire device is driven by motor |03 operating through suitable gears IDI, notshown in detail, which rotate shaft 99. In cation of material it is sometimes desirable to spray water through spray |92 from' a source of means of rivets38 and toV side 45 and4-1 are attached bell crank lever A4 9 byl order to secure better classisupply not shown upon the upper end of section 29 intermediate between the water level in trough l and section 30 of rake 28.

The device herein described relates to a rake classifier comprising a trough having a bottom with a relatively long and substantially flat section and at the upper or discharge end thereof a relatively short section with a greater slope than the rst section, a classifying rake comprising a relatively long rake of the usual type hinged to to the upper end of which is a shorter rake of the same type, the whole of said rake adapted to operate along the bottom of said trough, and means for moving said rake upwardly along bottom of said trough, raising said rake with relation to bottom of said trough and returning the rake in the raised position to the extent of its backward position and lowering said rake to the bottom of said trough. The movement herein described is secured by means of the linkage shown in the present invention or its equivalent.

The advantages of this invention reside in the fact that in that part of the classifier which is `below `the surface o'f the liquid or is subjected to the spray, a deep slope would result in too much of the material being washed away. Therefore, the slope in this portion of the trough and rake should be comparatively flat. In order to drain the material before its discharge, it is advisable to have a considerably sharper slope y at the discharge end.

' tremes of its longitudinal movement and embodying the principal of the two distinct inclinations of the rake.

I claim:

1. A classifier comprising a trough having a bottom with a relatively long substantially flat section and at the upper end of said trough a relatively short section with a greater slope than the first section, a classifying rake with a relatively long substantially flat operating Zone, hinged to the upper end of which is a shorter rake, the whole of said rake adapted-to operate substantially parallel to and along the bottom of said trough, means for moving said rake substantially parallel to and upwardly along the bottom of said trough, raising said rake with relation to the bottom of said trough, returning the rake in the raised position to the extent of its backward position, and lowering said rake to the bottom of said trough, which last mentioned means comprises bell crank levers mounted at the opposite ends of the more nearly horizontal portion of the classifying rake and at the upper end of the more inclined portion of the rake, links connecting said bell crank levers with said rake and with each other, a rotatable shaft, a crank means rigidly secured to said shaft and a lever connecting said crank means with the bell cranks, means for feeding the material to be classified into the lower end of said trough, and means for removal of classified material.

2. A classifier comprising a trough having a working section and a discharge end section of greater upward slope than the working section, a rigid rake element cooperating with said working section, and another rigid rake element cooperating with said discharge section, said rigid rake elements being hingedly secured together, means to support and drive said hinged rake so that both its outer ends travel forwardly in a path substantially parallel to the section over which the end moves and the hinged portion is guided to travel in a predetermined path whereby the angle between the two rake elements varies during a cycle of operation, said drive means having mechanism to return said rake elements to their initial position after the forward travel has been completed, said mechanism including means to raise said elements away from the trough during such return movement and to lower said elements into the cooperative relation upon reaching the initial position.

3. A classifier comprising a trough having a classifying section and a discharge end section of greater upward slope than the classifying section, a rake element cooperating with said classifying section, and another rake element cooperating with said discharge section, said rake elements being hingedly secured together, means to support said hinged rake elements in suspended relation to the trough, drive means pivoted to a side of said trough for moving said rake elements so that the outer ends thereof travel forwardly in a path substantially parallel to the section over which the ends move and the hinged portion is guided to travel in a controlled path whereby the angle between the two rake elements varies during such travel, said drive means having a cranking mechanism adapted to return said rake elements to their initial position after the forward travel has been completed including means to raise said elements away from the trough during such return movement and to lower said elements into the cooperative relation upon reaching the initial position.

DAVID M. WRIGHT. 

